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Native American societies including the Chinook and the Salish had long-established coastal communities by the time Europeans arrived in the Pacific Northwest in the 18th century. Inland, on the arid plateaus between the Cascades and the Rocky Mountains, the Spokane, Nez Percé and other tribes thrived on seasonal migration between river valleys and temperate uplands.

Three hundred years after Columbus landed in the New World, Spanish and British explorers began probing the northern Pacific coast, seeking the fabled Northwest Passage. In 1792, Capt George Vancouver was the first explorer to sail the waters of Puget Sound, claiming British sovereignty over the entire region. At the same time, an American, Capt Robert Gray, found the mouth of the Columbia River. In 1805 the explorers Lewis and Clark crossed the Rockies and made their way down the Columbia to the Pacific Ocean, extending the US claim on the territory.

In 1824 the British Hudson’s Bay Company established Fort Vancouver in Washington as headquarters for the Columbia region. This opened the door to waves of settlers but had a devastating impact on the indigenous cultures, assailed as they were by the double threat of European diseases and alcohol.

In 1843 settlers at Champoeg, on the Willamette River south of Portland, voted to organize a provisional government independent of the Hudson’s Bay Company, thereby casting their lot with the USA, which formally acquired the territory from the British by treaty in 1846. Over the next decade, some 53, 000 settlers came to the Northwest via the 2000-mile-long Oregon Trail.

Arrival of the railroads set the region’s future. Agriculture and lumber became the pillars of the economy until 1914, when the opening of the Panama Canal and WWI brought increased trade to Pacific ports. Shipyards opened along Puget Sound, and the Boeing aircraft company set up shop near Seattle.

Big dam projects in the 1930s and ’40s provided cheap hydroelectricity and irrigation. WWII offered another boost for aircraft manufacturing and shipbuilding, and agriculture continued to thrive. In the postwar period Washington’s population, especially around Puget Sound, grew to twice that of Oregon. But hydroelectricity production and the massive irrigation projects along the Columbia have nearly destroyed the river’s ecosystem. Logging has also left its scars, especially in Oregon. The environment remains a contentious issue in the Northwest; flash points are the logging of old-growth forests and the destruction of salmon runs in streams and rivers.

In the 1980s and ’90s, the economic emphasis shifted again with the rise of the high-tech industry, embodied by Microsoft in Seattle and Intel in Portland. The region has also reinvigorated its ecocredentials and stands at the forefront of US efforts to offset climate change.